An event that is triggered when the Mouse moves over a GUI component
A MouseHoverEvent is an event that is triggered when a Mouse input device is moved over the top of a GUI component. This 'hover' action triggered an event when the mouse enters the co-ordinates of the GUI component, and depending on the programming language, may also be triggered when leaving the GUI component co-ordinates. For Java, both are triggered, causing either an onHover or a onHoverOut variant of this event.